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Optical glass grinding method and optical glass lens manufacturing method

A technology for optical glass and grinding, which is applied to optical surface grinders, grinding/polishing equipment, manufacturing tools, etc. It can solve the problems of reduced production efficiency, increased production cost, and increased time, and achieves low-cost effects

Inactive Publication Date: 2017-03-01
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the time required for the grinding process until grinding inevitably increases, which leads to a decrease in production efficiency and an increase in production cost.
[0018] In particular, in the case of grinding optical glass stamped products, rough grinding is physically required, so further improvement in productivity has been difficult in the past

Method used

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  • Optical glass grinding method and optical glass lens manufacturing method
  • Optical glass grinding method and optical glass lens manufacturing method
  • Optical glass grinding method and optical glass lens manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0166]In Example 1, a stamped product formed of FCD1 (manufactured by HOYA Co., Ltd., nd=1.49700, vd=81.61), which is a difficult-to-process glass material, was ground to produce a lens with a diameter of 35.8 mm and a surface radius of curvature of 44.72 mm. mm optical glass lens (spherical lens). Grinding is performed by executing the ELID process during the execution of the CG machining process in one grinding process in which the rough grinding process and the finish grinding process are unified. Using a cup-shaped abrasive 3 with a cup diameter of 40 mm and abrasive grain size #2000, the CG processing step was performed under the following processing conditions with the rotation axis of the cup-shaped abrasive 3 inclined at α=14°. That is, the rotational speed of the cup-shaped abrasive 3 was 20000 rpm, and the feed rate was 2 μm / sec. In addition, the rotation speed of the turntable 2 was 50 rpm, and the applied voltage of the voltage application part 6 was 150V. In add...

Embodiment 2

[0169] In Example 2, the rotational speed and feed rate of the cup-shaped abrasive 3 are different from those in the case of Example 1 described above. In Example 2, the rotational speed of the cup-shaped abrasive 3 was 30,000 rpm, and the feed rate was 5 μm / sec. Other conditions are the same as in Example 1.

[0170] As a result of grinding under the above processing conditions, the surface roughness Rz of the lens surface of the processed lens made of difficult-to-process glass material was 0.20 μm. In addition, the processing time when the cutting amount was 80 μm was 25 seconds.

Embodiment 3

[0172] In Example 3, the feeding speed of the cup-shaped abrasive 3 is different from that in the case of Example 1 described above. In Example 3, the feed rate of the cup-shaped abrasive 3 was set to 1 μm / sec. Other conditions are the same as in Example 1.

[0173] As a result of grinding under the above processing conditions, the surface roughness Rz of the lens surface of the processed lens made of difficult-to-process glass material was 0.60 μm. In addition, the machining time was 90 seconds when the cutting amount was set to 80 μm.

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Abstract

The invention provides a grinding processng method of optical glass and a manufacturing method of optical glass lens. The grinding processing can be realized at low cost in a condition of not reducing quality. The method is realized through the following procedures. The optical glass is punched into a predetermined shape to form a punching body (S5A, S5B). A conductivity cup-shaped grinding material having a grinding surface used for fine grinding is made to abut against the punching body having a to-be-grinded face and the cup-shaped grinding material is driven rotating, thereby realizing fine grinding (S6b). In the grinding procedure, conductive grinding liquid is provided between an electrode arranged opposite to the grinding face of the cup-shaped grinding material and the cup-shaped grinding material. At the same time, a predetermined voltage is exerted between the electrode and the cup-shaped grinding material, thereby reazling the electrolytic in-process dressing of the grinding surface.

Description

technical field [0001] The invention relates to a grinding process method of optical glass and a manufacturing method of optical glass lens. Background technique [0002] Optical glass lenses (hereinafter also simply referred to as lenses) used in optical devices such as cameras can be obtained by grinding optical glass made of a glass material having desired optical properties, and then grinding. [0003] Among them, the grinding process requires the following two-stage process: After rough grinding is performed as a process that prioritizes processing efficiency over the quality of the ground surface such as roughness, it is used to adjust the shape accuracy and surface quality. State of the processing process of fine grinding. Specifically, the grinding method shown below has been conceived. [0004] For example, in Patent Document 1, a lens grinding process is performed by performing a rough grinding process using a spherical surface creation machine (hereinafter refer...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B24B13/01
Inventor 下嶋胜治
Owner HOYA CORP